March 22 (Reuters) - Wall Street looked set to open lower on
Tuesday after explosions in Brussels sparked fresh geopolitical
concerns and sent investors scurrying for safe-haven assets.

At least 26 people were killed in twin attacks on Brussels
airport and a rush-hour metro train in the Belgian capital,
triggering security alerts across western Europe.

European markets fell, while traditional safe havens gold
and government bonds firmed up as reports of the events in the
de facto capital of the European Union unfolded. Airline and
travel-related stocks were the worst hit.

Shares of American Airlines, Southwest Airlines
, Delta Airlines, United Continental Holdings
, JetBlue Airways, and Spirit Airlines
were down between 3.3 percent and 1.6 percent in premarket
trading.
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